Re: [tcf-dev] How to detect if a symbol is COMMON ?

[Eugene Tarassov <eugene.tarassov@xxxxxxxxxx>]

Hi Xavier,

You can find matching ELF symbol like this:

    map_to_sym_table(sym->obj, &elf_sym);

Regards,
Eugene

-----Original Message-----
From: tcf-dev-bounces@xxxxxxxxxxx [mailto:tcf-dev-bounces@xxxxxxxxxxx] On Behalf Of Xavier Pouyollon
Sent: Wednesday, June 25, 2014 9:44 AM
To: TCF Development
Subject: [tcf-dev] How to detect if a symbol is COMMON ?

Hi Eugene,

In symbols_elf.c:has_symbol_address, I need to determine, in case of
vxWorks common support for kernel modules, if a symbol is common or not.

sym->obj != NULL so we have the debug infos.
In that case, sym->tbl is then NULL so it's not easy to know the symbol
type.

Can I assume the following:
     if (sym->obj != NULL) {
         if (sym->obj->mFlags & DOIF_location) {
             /* AT_location defined, so we have an address */

             /* VxWorks common : The DKM do have AT_location but we
don't have the relocation */
             /* Either the extension point  ELF_SYMS_GET_ADDR returns
the defined common */
             /* OR we need to go down in the search to find a non-common
symbol. */
             if  (sym->obj->mFlags & DOIF_external)
                 return 0;
             else
                 return 1;
         }

Any better proposal ?

PS : In that case, the DKM has:
WIND_TCB * taskIdCurrent;

and taskIdCurrent being defined in the vxWorks kernel.
Our extension point only returns addresses for defined common for a
given module.
In that case, the common is resolved (into the kernel)
so the extension point doesn't return an address so I need to continue
the search.

Thanks !
Very Best Regards,
Xavier.

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